CVE-2025-6011

Description

A timing side channel in Vault and Vault Enterprise’s (“Vault”) userpass auth method allowed an attacker to distinguish between existing and non-existing users, and potentially enumerate valid usernames for Vault’s Userpass auth method. Fixed in Vault Community Edition 1.20.1 and Vault Enterprise 1.20.1, 1.19.7, 1.18.12, and 1.16.23.

CVSS v3.1 Score

3.7

LOW

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Weakness Type (CWE)

CWE-203 CWE-203

Affected Products

Vendor	Product	Versions
hashicorp	vault	< 1.16.23
hashicorp	vault	< 1.20.1
hashicorp	vault	1.17.0 — 1.18.12
hashicorp	vault	1.19.0 — 1.19.7
hashicorp	vault	All

References

Advisories & Patches

https://discuss.hashicorp.com/t/hcsec-2025-15-timing-side-channel-in-vault-s-userpass-auth-method/76034

Frequently Asked Questions

What is CVE-2025-6011? +

A timing side channel in Vault and Vault Enterprise’s (“Vault”) userpass auth method allowed an attacker to distinguish between existing and non-existing users, and potentially enumerate valid usernames for Vault’s Userpass auth method. Fixed in Vault Community Edition 1.20.1 and Vault Enterprise 1.20.1, 1.19.7, 1.18.12, and 1.16.23. It has a CVSS v3.1 base score of 3.7 (LOW).

How severe is CVE-2025-6011? +

CVE-2025-6011 has a CVSS v3.1 score of 3.7 out of 10, rated LOW. This is a low-severity vulnerability with limited impact.

What products are affected by CVE-2025-6011? +

CVE-2025-6011 affects products from hashicorp, specifically: vault. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-6011? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2025-24506

A specific authentication strategy allows to learn ids of PAM users associated with certain authentication types.

CVE-2025-29780

Post-Quantum Secure Feldman's Verifiable Secret Sharing provides a Python implementation of Feldman's Verifiable Secret Sharing (VSS) scheme. In versions 0.8.0b2 …

CVE-2024-11084

Helix ALM prior to 2025.1 returns distinct error responses during authentication, allowing an attacker to determine whether a username exists.

CVE-2025-6056

Timing difference in password reset in Ergon Informatik AG's Airlock IAM 7.7.9, 8.0.8, 8.1.7, 8.2.4 and 8.3.1 allows unauthenticated attackers …

CVE-2025-13912

Multiple constant-time implementations in wolfSSL before version 5.8.4 may be transformed into non-constant-time binary by LLVM optimizations, which can potentially …

CVE-2024-23771 9.8

darkhttpd before 1.15 uses strcmp (which is not constant time) to verify authentication, which makes it easier for remote attackers …